One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,15)(12,16)(13,14)(19,27)(20,30)(23,32)(24,28) involution — undirected(1,3)(2,5)(4,8)(6,7)(17,18,21,25)(19,28,27,24)(20,23,30,32)(22,31,29,26)(10,14)(15,16)(17,19,21,27)(18,23,25,32)(20,22,30,29)(24,31,28,26)(2,6)(5,7)(9,11,13,12)(10,15,14,16)(19,27)(20,30)(23,32)(24,28)(3,8)(5,7)(9,12,13,11)(10,16,14,15)(17,20,21,30)(18,24,25,28)(19,29,27,22)(23,26,32,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.